<form class="row form-inline">
  <div class="form-group col-sm-3 col-xs-6">
    <input type="text" class="form-control" id="exampleInputName2" placeholder="Name">
  </div>
  <div class="form-group col-sm-3 col-xs-6">
    <input type="email" class="form-control" id="exampleInputEmail2" placeholder="Email">
  </div>
  <div class="checkbox">
    <label class="custom-checkbox">
      <input type="checkbox">
      <span>Remember me</span>
    </label>
  </div>
  <button type="submit" class="btn btn-primary">Send invitation</button>
</form>